[codegeek]

I have come to this conclusion :

Personal/Family/Friends: Facebook

Professional/Business: Linkedin

Celebrity/Gossip/Politics: Twitter

I have a twitter account but who cares what I tweet. No one really unless I am a celebrity or a famous politician.

[RileyKyeden]

Facebook is where I quarantine family and people whose interests diverged from my own over time, but are still good to keep in touch with. I don't use Linkedin.

Twitter is where friends/personal stuff happens. You should find a community beyond the stuff they push at sign up. There's so much there beyond celebrities, gossip, and politics.

[chrisseaton]

LinkedIn for professional? I don't know what industry or field you are in, but you can't really have discussions on LinkedIn can you? I'm in computer science and a lot of things are announced or organised over Twitter.

[SyneRyder]

As much as I hate LinkedIn, I've seen a lot of corporates using it for discussions & posting long form articles & case studies. Typically in legal, manufacturing & Fortune 500 marketing. LinkedIn has a lot of Facebook-esque features now.

But if you're not excited by conversations about legal implications of safety harness design or improvements to cardboard box manufacturing processes, then you probably wouldn't enjoy LinkedIn....